The following is a Security Bulletin from the Microsoft Product Security
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Microsoft Security Bulletin (MS00-066)
Patch Available for "Malformed RPC Packet" Vulnerability
Originally posted: September 11, 2000
Microsoft has released a patch that eliminates a security
vulnerability in Microsoft(r) Windows 2000. The vulnerability could
allow a malicious user to cause a Denial of Service on a Windows 2000
Frequently asked questions regarding this vulnerability and the patch
can be found at
A remote denial of service vulnerability has been discovered in
Microsoft Windows 2000 Server. The denial of service can occur when a
malicious client sends a particular malformed RPC (Remote Procedure
Call) packet to the server, causing the RPC service to fail.
Windows 2000 servers that are directly exposed to the Internet are at
greatest risk from this vulnerability. A server behind a firewall
that blocks ports 135-139 and 445 will not be affected by this
vulnerability from the Internet.
RPC services and the functioning of the server could be restored
after an attack by rebooting the affected computer.
Affected Software Versions
- Microsoft Windows 2000 All Versions
Note: Microsoft Windows NT 4.0 is not affected by this vulnerability.
Microsoft Windows 2000:
- This patch will also be included in the next Service Pack for
Windows 2000 -- it can be applied to a computer with or without
Service Pack 1.
Note Additional security patches are available at the Microsoft
Please see the following references for more information related to
- Frequently Asked Questions: Microsoft Security Bulletin MS00-066,
- Microsoft Knowledge Base article Q272303 discusses this issue and
will be available soon.
- Microsoft TechNet Security web site,
Obtaining Support on this Issue
This is a fully supported patch. Information on contacting Microsoft
Product Support Services is available at
- September 11, 2000: Bulletin Created.
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Last Updated September 11, 2000
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